Due to their small dimensions, lightweight and excellent running accuracy, KAYDON® Reali-Slim bearings have proved to be the best solution for a high-tech bicycle wheel that is truly revolutionary. Known as the Copenhagen Wheel, the development enables a cyclist to store energy from braking and use it to provide an extra boost when overtaking or on tough gradients. Using sensors and a wireless connection to an iPhone on the handlebars, it can also monitor speed, direction, traffic conditions, as well as collect data on air pollution.